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title: Use Application Health extension with Azure Virtual Machine Scale Sets (preview)
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title: Use Application Health extension with Azure Virtual Machine Scale Sets
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description: Learn how to use the Application Health extension to monitor the health of your applications deployed on Virtual Machine Scale Sets.
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author: ju-shim
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ms.author: jushiman
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ms.topic: how-to
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ms.service: virtual-machine-scale-sets
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ms.subservice: extensions
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ms.date: 01/17/2023
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ms.date: 04/12/2023
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ms.reviewer: mimckitt
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ms.custom: mimckitt, devx-track-azurepowershell
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---
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# Using Application Health extension with Virtual Machine Scale Sets
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> [!IMPORTANT]
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> **Rich Health States** is currently in public preview. **Binary Health States** is generally available.
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> This preview version is provided without a service-level agreement, and we don't recommend it for production workloads. Certain features might not be supported or might have constrained capabilities.
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> For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).
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Monitoring your application health is an important signal for managing and upgrading your deployment. Azure Virtual Machine Scale Sets provide support for [Rolling Upgrades](virtual-machine-scale-sets-upgrade-scale-set.md#how-to-bring-vms-up-to-date-with-the-latest-scale-set-model) including [Automatic OS-Image Upgrades](virtual-machine-scale-sets-automatic-upgrade.md) and [Automatic VM Guest Patching](../virtual-machines/automatic-vm-guest-patching.md), which rely on health monitoring of the individual instances to upgrade your deployment. You can also use Application Health Extension to monitor the application health of each instance in your scale set and perform instance repairs using [Automatic Instance Repairs](virtual-machine-scale-sets-automatic-instance-repairs.md).
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This article describes how you can use the two types of Application Health extension, **Binary Health States** or **Rich Health States**, to monitor the health of your applications deployed on Virtual Machine Scale Sets.
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## Binary versus Rich Health States
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> [!IMPORTANT]
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> **Rich Health States** is currently in public preview.
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Application Health Extensions has two options available: **Binary Health States** and **Rich Health States**. The following table highlights some key differences between the two options. See the end of this section for general recommendations.
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| Features | Binary Health States | Rich Health States |
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